Felix Klein Quotes
Mathematics in general is fundamentally the science of self-evident things.
"Anwendung der Differential-und Integralrechnung auf Geometrie". Book by Georg Scheffers, p. 26, 1920.
Felix Klein (1893). “The Evanston Colloquium: Lectures on Mathematics Delivered from Aug. 28 to Sept. 9, 1893 Before Members of the Congress of Mathematics Held in Connection with the World's Fair in Chicago at Northwestern University, Evanston, Ill”
Felix Klein (1922). “Gesammelte mathematische Abhandlungen: Zur anschaulichen Geometrie. Zur Auflösung algebraischer Gleichungen. Physikalisches. Hrsg. von R. Fricke und H. Vermeil”
Felix Klein (1893). “The Evanston Colloquium: Lectures on Mathematics Delivered from Aug. 28 to Sept. 9, 1893 Before Members of the Congress of Mathematics Held in Connection with the World's Fair in Chicago at Northwestern University, Evanston, Ill”
Felix Klein (2016). “Elementary Mathematics from a Higher Standpoint: Volume I: Arithmetic, Algebra, Analysis”, p.166, Springer